Smoking In Middle Age May Boost Risk Of Dementia.

The study also said that - Smokers tended to be less educated and financially worse off than non-smokers.
http://www.libidoandhealth.com/blog/smoking/

clipped from www.bloomberg.com June 9 (Bloomberg) -- Middle-aged smokers are more likely to have poorer memories and reasoning abilities than those who've never smoked habitually, according to a study published in the Archives of Internal Medicine. Researchers in France and England also found smokers drank more alcohol, ate less fruit and vegetables and had higher cholesterol levels than non-smokers. The results are from a 17- year-long study of more than 5,300 people. The findings add weight to evidence of a link between smoking and dementia, and may even underestimate the extent to which the two are related because smokers were more likely to not participate in follow-up tests or to have died over the course of the study, the authors wrote. The researchers found smokers were 54 percent more likely than non-smokers to be in the lowest 20 percent of subjects on a memory test, and equally likely to flunk a test of verbal and mathematical reasoning.